Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated
    Dim arrColor() As String = {"Red", "Blue", "Silver", "Green"}
    Dim intIndex As Integer = CType(e.Row.RowIndex, Integer) - 1

    If intIndex >= 0 Then
      GridView1.Rows(intIndex).BackColor = arrColor(Int(3 * Rnd))
    ElseIf intIndex < 0 And gvOrders.Rows.Count > 0 Then
      intIndex = GridView1.Rows.Count - 1
      GridView1.Rows(intIndex).BackColor = arrColor(Int(3 * Rnd))
    End If
End Sub